Answer: In our area we do stock tilapia for algae control in certain situations. They do do a good job on some types of algae. It’s really good to have the algae identified first. Most species, they will clean it up pretty well. But we do stock them for that purpose. And also, not only algae, but some of the smaller microphytes, like duckweed and watermeal, they’re effective on those in some situations.